Smooth

Sinatra: How he became a star by eclipsing his mentor, Tommy Dorsey.
Silk: What the material has to offer science.
Delivery: The experience of giving birth on a plane.
Bubble: What will adding a blue bubble to the top of a museum do to its stature and its offerings?

Physics

Size: There are some ways for our brains to grasp the vastness of the universe.
Soccer: How physics explains why goalkeepers miss shots from afar.

*Photo courtesy Sybilia Portman.